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Stratigraphy, lithology, paleomagnetism, and fission track ages of some ignimbrite formations in the Matahana Basin, New Zealand

1981; Taylor & Francis; Volume: 24; Issue: 3 Linguagem: Inglês

10.1080/00288306.1981.10422723

ISSN

1175-8791

Autores

Richard P. Murphy, Diane Seward,

Tópico(s)

Geology and Paleoclimatology Research

Resumo

Abstract Three new ignimbrite formations are described from the Matahana Basin, southwest of Rotorua, and are formally named the Pukerimu Ignimbrite, Tikorangi Ignimbrite, and Rahopaka Ignimbrite . All are older than 0.72 Ma. This is confirmed by fission track dating of zircons extracted from 2 of these ignimbrites and additional dates on younger horizons. The Tikorangi Ignimbrite is dated at 1.03 ± 0.18 Ma, Rahopaka Ignimbrite at 0.72 ± 0.16 Ma, Marshall Ignimbrite at 0.52 ± 0.14 Ma, and the Mamaku Ignimbrite at 0.14 ± 0.08 Ma. Keywords: Pukerimu IgnimbriteTikorangi IgnimbriteRahopaki IgnimbriteMarshall Ignimbritenew stratigraphic namesMatahana Basinpaleomagnetismfission track dating

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